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ARM updates for 6.13-rc1

Browse Source 
- add dev_is_amba() function to allow conversions during the next cycle
 - improve PREEMPT_RT performance with VFP
 - KASAN fixes for vmap stack
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux

Pull ARM updates from Russell King:

 - add dev_is_amba() function to allow conversions during the next cycle

 - improve PREEMPT_RT performance with VFP

 - KASAN fixes for vmap stack

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux:
  ARM: 9431/1: mm: Pair atomic_set_release() with _read_acquire()
  ARM: 9430/1: entry: Do a dummy read from VMAP shadow
  ARM: 9429/1: ioremap: Sync PGDs for VMALLOC shadow
  ARM: 9426/1: vfp: Move sending signals outside of vfp_state_hold()ed section.
  ARM: 9425/1: vfp: Use vfp_state_hold() in vfp_support_entry().
  ARM: 9424/1: vfp: Use vfp_state_hold() in vfp_sync_hwstate().
  ARM: 9423/1: vfp: Provide vfp_state_hold() for VFP locking.
  ARM: 9415/1: amba: Add dev_is_amba() function and export it for modules
This commit is contained in:
Linus Torvalds 2024-11-29 10:31:18 -08:00
commit 9d5daef3b3
5 changed files with 102 additions and 26 deletions
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8
arch/arm/kernel/entry-armv.S
View File

@ -25,6 +25,7 @@
#include <asm/tls.h>
#include <asm/system_info.h>
#include <asm/uaccess-asm.h>
#include <asm/kasan_def.h>
#include "entry-header.S"
#include <asm/probes.h>
@ -561,6 +562,13 @@ ENTRY(__switch_to)
@ entries covering the vmalloc region.
@
ldr r2, [ip]
#ifdef CONFIG_KASAN_VMALLOC
@ Also dummy read from the KASAN shadow memory for the new stack if we
@ are using KASAN
mov_l r2, KASAN_SHADOW_OFFSET
add r2, r2, ip, lsr #KASAN_SHADOW_SCALE_SHIFT
ldr r2, [r2]
#endif
#endif
@ When CONFIG_THREAD_INFO_IN_TASK=n, the update of SP itself is what

35
arch/arm/mm/ioremap.c
View File

@ -23,6 +23,7 @@
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kasan.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/io.h>
@ -115,16 +116,40 @@ int ioremap_page(unsigned long virt, unsigned long phys,
}
EXPORT_SYMBOL(ioremap_page);
#ifdef CONFIG_KASAN
static unsigned long arm_kasan_mem_to_shadow(unsigned long addr)
{
return (unsigned long)kasan_mem_to_shadow((void *)addr);
}
#else
static unsigned long arm_kasan_mem_to_shadow(unsigned long addr)
{
return 0;
}
#endif
static void memcpy_pgd(struct mm_struct *mm, unsigned long start,
unsigned long end)
{
end = ALIGN(end, PGDIR_SIZE);
memcpy(pgd_offset(mm, start), pgd_offset_k(start),
sizeof(pgd_t) * (pgd_index(end) - pgd_index(start)));
}
void __check_vmalloc_seq(struct mm_struct *mm)
{
int seq;
do {
seq = atomic_read(&init_mm.context.vmalloc_seq);
memcpy(pgd_offset(mm, VMALLOC_START),
pgd_offset_k(VMALLOC_START),
sizeof(pgd_t) * (pgd_index(VMALLOC_END) -
pgd_index(VMALLOC_START)));
seq = atomic_read_acquire(&init_mm.context.vmalloc_seq);
memcpy_pgd(mm, VMALLOC_START, VMALLOC_END);
if (IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
unsigned long start =
arm_kasan_mem_to_shadow(VMALLOC_START);
unsigned long end =
arm_kasan_mem_to_shadow(VMALLOC_END);
memcpy_pgd(mm, start, end);
}
/*
* Use a store-release so that other CPUs that observe the
* counter's new value are guaranteed to see the results of the

74
arch/arm/vfp/vfpmodule.c
View File

@ -55,6 +55,34 @@ extern unsigned int VFP_arch_feroceon __alias(VFP_arch);
*/
union vfp_state *vfp_current_hw_state[NR_CPUS];
/*
* Claim ownership of the VFP unit.
*
* The caller may change VFP registers until vfp_state_release() is called.
*
* local_bh_disable() is used to disable preemption and to disable VFP
* processing in softirq context. On PREEMPT_RT kernels local_bh_disable() is
* not sufficient because it only serializes soft interrupt related sections
* via a local lock, but stays preemptible. Disabling preemption is the right
* choice here as bottom half processing is always in thread context on RT
* kernels so it implicitly prevents bottom half processing as well.
*/
static void vfp_state_hold(void)
{
if (!IS_ENABLED(CONFIG_PREEMPT_RT))
local_bh_disable();
else
preempt_disable();
}
static void vfp_state_release(void)
{
if (!IS_ENABLED(CONFIG_PREEMPT_RT))
local_bh_enable();
else
preempt_enable();
}
/*
* Is 'thread's most up to date state stored in this CPUs hardware?
* Must be called from non-preemptible context.
@ -240,7 +268,7 @@ static void vfp_panic(char *reason, u32 inst)
/*
* Process bitmask of exception conditions.
*/
static void vfp_raise_exceptions(u32 exceptions, u32 inst, u32 fpscr, struct pt_regs *regs)
static int vfp_raise_exceptions(u32 exceptions, u32 inst, u32 fpscr)
{
int si_code = 0;
@ -248,8 +276,7 @@ static void vfp_raise_exceptions(u32 exceptions, u32 inst, u32 fpscr, struct pt_
if (exceptions == VFP_EXCEPTION_ERROR) {
vfp_panic("unhandled bounce", inst);
vfp_raise_sigfpe(FPE_FLTINV, regs);
return;
return FPE_FLTINV;
}
/*
@ -277,8 +304,7 @@ static void vfp_raise_exceptions(u32 exceptions, u32 inst, u32 fpscr, struct pt_
RAISE(FPSCR_OFC, FPSCR_OFE, FPE_FLTOVF);
RAISE(FPSCR_IOC, FPSCR_IOE, FPE_FLTINV);
if (si_code)
vfp_raise_sigfpe(si_code, regs);
return si_code;
}
/*
@ -324,6 +350,8 @@ static u32 vfp_emulate_instruction(u32 inst, u32 fpscr, struct pt_regs *regs)
static void VFP_bounce(u32 trigger, u32 fpexc, struct pt_regs *regs)
{
u32 fpscr, orig_fpscr, fpsid, exceptions;
int si_code2 = 0;
int si_code = 0;
pr_debug("VFP: bounce: trigger %08x fpexc %08x\n", trigger, fpexc);
@ -369,8 +397,8 @@ static void VFP_bounce(u32 trigger, u32 fpexc, struct pt_regs *regs)
* unallocated VFP instruction but with FPSCR.IXE set and not
* on VFP subarch 1.
*/
vfp_raise_exceptions(VFP_EXCEPTION_ERROR, trigger, fpscr, regs);
return;
si_code = vfp_raise_exceptions(VFP_EXCEPTION_ERROR, trigger, fpscr);
goto exit;
}
/*
@ -394,14 +422,14 @@ static void VFP_bounce(u32 trigger, u32 fpexc, struct pt_regs *regs)
*/
exceptions = vfp_emulate_instruction(trigger, fpscr, regs);
if (exceptions)
vfp_raise_exceptions(exceptions, trigger, orig_fpscr, regs);
si_code2 = vfp_raise_exceptions(exceptions, trigger, orig_fpscr);
/*
* If there isn't a second FP instruction, exit now. Note that
* the FPEXC.FP2V bit is valid only if FPEXC.EX is 1.
*/
if ((fpexc & (FPEXC_EX | FPEXC_FP2V)) != (FPEXC_EX | FPEXC_FP2V))
return;
goto exit;
/*
* The barrier() here prevents fpinst2 being read
@ -413,7 +441,13 @@ static void VFP_bounce(u32 trigger, u32 fpexc, struct pt_regs *regs)
emulate:
exceptions = vfp_emulate_instruction(trigger, orig_fpscr, regs);
if (exceptions)
vfp_raise_exceptions(exceptions, trigger, orig_fpscr, regs);
si_code = vfp_raise_exceptions(exceptions, trigger, orig_fpscr);
exit:
vfp_state_release();
if (si_code2)
vfp_raise_sigfpe(si_code2, regs);
if (si_code)
vfp_raise_sigfpe(si_code, regs);
}
static void vfp_enable(void *unused)
@ -512,11 +546,9 @@ static inline void vfp_pm_init(void) { }
*/
void vfp_sync_hwstate(struct thread_info *thread)
{
unsigned int cpu = get_cpu();
vfp_state_hold();
local_bh_disable();
if (vfp_state_in_hw(cpu, thread)) {
if (vfp_state_in_hw(raw_smp_processor_id(), thread)) {
u32 fpexc = fmrx(FPEXC);
/*
@ -527,8 +559,7 @@ void vfp_sync_hwstate(struct thread_info *thread)
fmxr(FPEXC, fpexc);
}
local_bh_enable();
put_cpu();
vfp_state_release();
}
/* Ensure that the thread reloads the hardware VFP state on the next use. */
@ -683,7 +714,7 @@ static int vfp_support_entry(struct pt_regs *regs, u32 trigger)
if (!user_mode(regs))
return vfp_kmode_exception(regs, trigger);
local_bh_disable();
vfp_state_hold();
fpexc = fmrx(FPEXC);
/*
@ -748,6 +779,7 @@ static int vfp_support_entry(struct pt_regs *regs, u32 trigger)
* replay the instruction that trapped.
*/
fmxr(FPEXC, fpexc);
vfp_state_release();
} else {
/* Check for synchronous or asynchronous exceptions */
if (!(fpexc & (FPEXC_EX | FPEXC_DEX))) {
@ -762,17 +794,17 @@ static int vfp_support_entry(struct pt_regs *regs, u32 trigger)
if (!(fpscr & FPSCR_IXE)) {
if (!(fpscr & FPSCR_LENGTH_MASK)) {
pr_debug("not VFP\n");
local_bh_enable();
vfp_state_release();
return -ENOEXEC;
}
fpexc |= FPEXC_DEX;
}
}
bounce: regs->ARM_pc += 4;
/* VFP_bounce() will invoke vfp_state_release() */
VFP_bounce(trigger, fpexc, regs);
}
local_bh_enable();
return 0;
}
@ -837,7 +869,7 @@ void kernel_neon_begin(void)
unsigned int cpu;
u32 fpexc;
local_bh_disable();
vfp_state_hold();
/*
* Kernel mode NEON is only allowed outside of hardirq context with
@ -868,7 +900,7 @@ void kernel_neon_end(void)
{
/* Disable the NEON/VFP unit. */
fmxr(FPEXC, fmrx(FPEXC) & ~FPEXC_EN);
local_bh_enable();
vfp_state_release();
}
EXPORT_SYMBOL(kernel_neon_end);

6
drivers/amba/bus.c
View File

@ -449,6 +449,12 @@ const struct bus_type amba_bustype = {
};
EXPORT_SYMBOL_GPL(amba_bustype);
bool dev_is_amba(const struct device *dev)
{
return dev->bus == &amba_bustype;
}
EXPORT_SYMBOL_GPL(dev_is_amba);
static int __init amba_init(void)
{
return bus_register(&amba_bustype);

5
include/linux/amba/bus.h
View File

@ -121,6 +121,7 @@ extern const struct bus_type amba_bustype;
#ifdef CONFIG_ARM_AMBA
int __amba_driver_register(struct amba_driver *, struct module *);
void amba_driver_unregister(struct amba_driver *);
bool dev_is_amba(const struct device *dev);
#else
static inline int __amba_driver_register(struct amba_driver *drv,
struct module *owner)
@ -130,6 +131,10 @@ static inline int __amba_driver_register(struct amba_driver *drv,
static inline void amba_driver_unregister(struct amba_driver *drv)
{
}
static inline bool dev_is_amba(const struct device *dev)
{
return false;
}
#endif
struct amba_device *amba_device_alloc(const char *, resource_size_t, size_t);